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Merge pull request #977 from leosunli/trunk 

HDFS-14541. When evictableMmapped or evictable size is zero, do not throw NoSuchElementException.
This commit is contained in:
Inigo Goiri 2019-06-24 17:44:54 -07:00 committed by GitHub
parent 129576f628 daa1e14745
commit 38a560c6f1
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 29 deletions
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hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/shortcircuit/ShortCircuitCache.java
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@ -109,13 +109,8 @@ public void run() {
int numDemoted = demoteOldEvictableMmaped(curMs);
int numPurged = 0;
Long evictionTimeNs;
while (true) {
Object eldestKey;
try {
eldestKey = evictable.firstKey();
} catch (NoSuchElementException e) {
break;
}
while (!evictable.isEmpty()) {
Object eldestKey = evictable.firstKey();
evictionTimeNs = (Long)eldestKey;
long evictionTimeMs =
TimeUnit.MILLISECONDS.convert(evictionTimeNs, TimeUnit.NANOSECONDS);
@ -493,13 +488,8 @@ private int demoteOldEvictableMmaped(long now) {
boolean needMoreSpace = false;
Long evictionTimeNs;
while (true) {
Object eldestKey;
try {
eldestKey = evictableMmapped.firstKey();
} catch (NoSuchElementException e) {
break;
}
while (!evictableMmapped.isEmpty()) {
Object eldestKey = evictableMmapped.firstKey();
evictionTimeNs = (Long)eldestKey;
long evictionTimeMs =
TimeUnit.MILLISECONDS.convert(evictionTimeNs, TimeUnit.NANOSECONDS);
@ -533,23 +523,15 @@ private void trimEvictionMaps() {
long now = Time.monotonicNow();
demoteOldEvictableMmaped(now);
while (true) {
long evictableSize = evictable.size();
long evictableMmappedSize = evictableMmapped.size();
if (evictableSize + evictableMmappedSize <= maxTotalSize) {
return;
}
while (evictable.size() + evictableMmapped.size() > maxTotalSize) {
ShortCircuitReplica replica;
try {
if (evictableSize == 0) {
replica = (ShortCircuitReplica)evictableMmapped.get(evictableMmapped
.firstKey());
} else {
replica = (ShortCircuitReplica)evictable.get(evictable.firstKey());
}
} catch (NoSuchElementException e) {
break;
if (evictable.isEmpty()) {
replica = (ShortCircuitReplica) evictableMmapped
.get(evictableMmapped.firstKey());
} else {
replica = (ShortCircuitReplica) evictable.get(evictable.firstKey());
}
if (LOG.isTraceEnabled()) {
LOG.trace(this + ": trimEvictionMaps is purging " + replica +
StringUtils.getStackTrace(Thread.currentThread()));